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Exam 6 A&P

Origin-Insertion-Action-Innervation of Upper Limb

QuestionAnswer
Origin of Teres Major Inferior angle and lower one-third part of the lateral border of the scapula
Insertion of Teres Major crest of the less tubercle of the humerus
Innervation of Teres Major Lower subscapular nerve (C5,6,7)
Action of Teres Major Extends, Adduction and medial rotation of the glenohumeral joint
Origin of Teres Minor upper two-thirds of Lateral border of the scapula (middle part)
Insertion of Teres Minor Greater tubercle of the humerus (inferior facet)
Action of Teres Minor Lateral rotation and adduct of the shoulder (Arm) at glenohumeral joint, stabilization of the head of humerus, as part of the rotator cuff muscles in glenoid cavity
Innervation of Teres Minor Axillary nerve (C5, 6)
Origin of Infraspinatus Infraspinous fossa of the scapula
Insertion of Infraspinatus Greater tubercle of the humerus (middle facet)
Action of Infraspinatus Lateral rotation and adduct of the Shoulder (arm) at (glenohumeral joint), stabilization of the humerus as part of the rotator cuff muscles (glenoid cavity)
Innervation of Infraspinatus Suprascapular nerve (C4, 5, 6)
Origin of Supraspinatus Supraspinous fossa of the scapula
Insertion of Supraspinatus Greater tubercle of the humerus (superior facet)
Action of Supraspinatus Assistance in arm abduction, stabilization of the humerus as part of the rotator cuff muscles; Stabilization of head of humerus in glenoid cavity
Innervation of Supraspinatus Suprascapular nerve (C4, 5, 6)
Origin of Serratus anterior Lateral parts (external surface) of the 1st to 8th ribs
Insertion of Serratus anterior Anterior Surface Medial border of the scapula
Action of Serratus anterior Adduct, upwardly rotate, and depress scapula at scapulothoracic joint (S/T joint); may elevate thorax during inhalation with scapula fixed
Innervation of Serratus anterior Long thoracic nerve (C5, 6, 7, 8)
Origin of Subscapularis Subscapular fossa
Insertion of Subscapularis Lesser tubercle of the humerus
Action of Subscapularis Medial rotation of the arm, stabilization of the humerus as part of the rotator cuff muscles
Innervation of Subscapularis Upper and lower subscapular nerves
Origin of Levator scapulae Transverse process of the atlas and axis, posterior tubercles C3 and C4
Insertion of Levator scapulae Posterior surface of the medial scapular border (from the superior angle to the root of the spine of the scapula)
Action of Levator scapulae Elevation of the scapula
Innervation of Levator scapulae Anterior rami of the nerves C3 and C4, dorsal scapular nerve (branch of the C5)
Origin of Rhomboid major spinous processes of T2 to T5
Insertion of Rhomboid major medial border of scapula from the level of the spine to the inferior angle
Action of Rhomboid major retraction and fixation of the scapula on the thoracic wall
Innervation of Rhomboid major dorsal scapular nerve
Origin of Rhomboid minor nuchal ligament, spinous processes of C7 and T1 vertebrae
Insertion of Rhomboid minor medial end of the scapular spine
Action of Rhomboid minor retraction and fixation of the scapula on the thoracic wall
Innervation of Rhomboid minor dorsal scapular nerve
Origin of Trapezius medial portion of Superior nuchal line of occiput, external occipital protuberance, nuchal ligament, spinous processes of C7 to T12 vertebrae
Insertion of Trapezius Lateral third of the clavicle, acromion and spine of the scapula
Action of Trapezius Elevation, depression, and retraction of the scapula
Innervation of Trapezius Spinal portion of cranial nerves XI (accessory) and ventral ramus (C2, 3, 4)
Action of Upper fibers of Trapezius bilaterally extend neck and head
Action of Upper fibers of Trapezius unilaterally Lateral flex head and neck to same side-Rotate head and neck opposites side-Elevate & Upwardly rotate scapula at scapulothoracic joint)
Action of middle fibers of Trapezius Adduct and stabilize the scapula at scapulothoracic joint
Action of lower fibers of Trapezius Depress and upwardly rotate the scapula at scapulothoracic joint
Four muscle of Rotator Cuff;
Created by: JML19
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